Critical currents in proton-irradiated single-crystal Ba 2YCu3O7-δ

R. B. Van Dover, E. M. Gyorgy, A. E. White, L. F. Schneemeyer, R. J. Felder, J. V. Waszczak

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Irradiation with 3.5 MeV protons creates defects in Ba2YCu 3O7-δ, which can act as strong pinning sites, comparable to those produced by neutron irradiation. Indeed protons as well as neutrons undergo momentum-transferring collisions that result in atomic displacements; the additional electronic proton-solid interaction does not appear to yield defects which contribute to pinning. Under optimized conditions we have obtained Jc(T→0, H=1 T)∼2×107 A/cm2 in single crystals. At 77 K the value is still J c∼1.7×105 A/cm2, decreasing only threefold in a field of 6 T. The fluence and temperature dependence of J c suggest a model, in which spatially uncorrelated defects pin vortex cores.

Original languageEnglish
Pages (from-to)2681-2683
Number of pages3
JournalApplied Physics Letters
Issue number26
StatePublished - 1990


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